When a black hat hacker dies after an extortion scheme gone wrong, the team learns he was involved with a website dedicated to infidelity. As the case develops, Kirsten discovers that the hacker was actually set up by someone with an extreme thirst for revenge. But when the killer turns their attention to the team's personal lives, the Stitchers find themselves in grave danger at every turn. Meanwhile, Cameron's recent brush with death gives him a new perspective on life, and Linus finally moves out of his parents' house and into a fully equipped smart house

When Fisher's mentor turns up dead, Kirsten's stitch reveals the officer was murdered by a serial killer she's been chasing for years. Camille's rebellious older brother Theo arrives in town with a whole lot of trouble. Meanwhile, Cameron is finally honest with Kirsten about his feelings for her.

When an unidentified, severely damaged body is recovered in a dumpster, Kirsten’s stitch divulges that the victim has two death scenes from two very different times in his life. Camille tires of her brother Theo’s irresponsible ways and finally puts her foot down. Linus turns to Cameron for help with a sticky situation. Detective Fisher and Kirsten uncover a clue about her father.

When a young woman falls to her death with a cryptic note attached to her body, Kirsten is convinced the message is somehow tied to her own past.

When a Chinese pop diva is killed, her female bodyguard is blamed for the murder, who appears to have been passed out at the time of the homicide.

When a bright, young lawyer is found dead, the team suspects she was murdered because of a case she was working on. After theorizing the lawyer was killed because she discovered something criminal about her firm’s high profile client, the team heads to the firm to interview her four ambitious coworkers, each of whom seems more suspicious than the last. While at the firm, Maggie crosses paths with a former college boyfriend who may be closer to the murder than she’d like to admit. Meanwhile, Camille’s interactions with Liam take a surprising turn, and Kirsten learns something shocking during the stitch.

When a plane lands in Los Angeles with multiple dead passengers and no apparent cause, the Stitchers team sweeps into action. Now racing against the clock to determine if this is a terrorist attack or the work of a fellow passenger, Kirsten is tasked with stitching into one victim after another to learn exactly what happened. Cameron worries about Kirsten’s well-being and their new dynamic in light of his relationship with Nina. Meanwhile, Camille tries to help Linus through a personal issue, and Liam continues to cause problems.

Mitchell Blair directs Kirsten to shut down all investigation into finding her father. But Kirsten has finally made contact with someone she thinks can lead her to him. To gain her source’s trust, she tries to explain her role in the Stitchers program, without actually revealing the program’s nature. Treading carefully, Kirsten recounts the team’s current case, in which a series of murders is tied to a wildly popular new app.

Now closer than ever to uncovering the mysteries surrounding her parents, Kirsten’s mind is threatened when her stitch leads her deep into the recesses of her own memories.